I've done a little glass blasting-- I used the fine sand-- Masked the
glass off with three or four sheets of plastic shelf liner & used a
knife to cut my design. With sand blasting, make sure you use a booth
for the blasting & do it in a well ventilated area with dust mask--
(read the warnings on the sand bag) The silica dust is REALLY bad for
you-- The glass I did this on was red flashed glass ( red on one side)
-- worked really well & left a frosty surface.